RU2464700C2 - Input device of radio receiver set - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: input device of radio receiver set includes M channels, additional cartridge of discrete capacitors, which contains input and output potential buses and P sections, each of which includes three capacitors the first outputs of which are connected to each other; to the second output of the first capacitor there connected is movable contact of the first switching element the fixed contact of which is connected to input potential bus of the cartridge of discrete capacitors; to the second output of the second capacitor there connected is movable contact of the second switching element the fixed contact of which is connected to output potential bus of cartridge of discrete capacitors; the second output of the third capacitor is connected to common bus; at that, each channel includes input and output bipole made in the form of inductance coil, switching elements and additional capacitor.

EFFECT: increasing the number of pass bands in each channel.

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Description

The invention relates to radio engineering and can be used in the input circuits of radio receivers, as well as harmonic filters of radio transmitters.

Known input device of the radio, made in the form of a wide-band switched filter containing M channels connected in parallel at the input and output, each of which contains a band-pass filter made in a T-shaped chain scheme. In the filter, an inductance coil is included in each longitudinal arm, and a capacitor in the transverse arm. Each channel has one switching element. [one]

However, the known device has a limited number of channels and a limited number of bandwidths.

The objective of the invention is to increase the number of bandwidths in each channel.

This is achieved by the fact that in the input device of the radio receiver containing M channels connected in parallel along the input and output, each channel containing an input and output two-terminal device, made in the form of an inductor, according to the invention, a discrete capacitor store is introduced containing potential input and output buses and P sections, each of which contains three capacitors, in which the first terminals are connected to each other, to the second terminal of the first capacitor is connected a movable contact of the first switching element in which the fixed contact is connected to the input potential bus of the discrete capacitor store, a movable contact of the second switching element is connected to the second terminal of the second capacitor, in which the fixed contact is connected to the output potential bus of the discrete capacitor store, the third terminal is connected to the common bus at the third capacitor, in each channel at the input two-terminal terminal, the first terminal is connected to the input potential terminal of the device, the second terminal is connected to the movable terminal the first and the second switching elements, while the first switching element has a fixed contact connected to the input potential bus of the discrete capacitor store, the second switching element has a fixed contact connected to the first terminal of the first additional capacitor, whose second terminal is connected to the common bus, the first two-terminal output the output is connected to the potential output terminal of the device, the second output is connected to the movable contact of the third and fourth switching element, when this, at the third switching element, the fixed contact is connected to the output potential bus of the discrete capacitor store, at the fourth switching element, the fixed contact is connected to the first terminal of the second additional capacitor, in which the second terminal is connected to the common bus.

The essence of the invention lies in the fact that a discrete capacitor store (MDC) is introduced into the device, which is configured to connect each channel to the input and output two-terminal devices. In this case, each channel has P bandwidths

In each channel, additional switching elements are introduced, which allow the input and output two-terminal devices to be turned on in idle channels in the notch mode.

The drawing shows an electrical schematic diagram of the proposed input device of the radio.

The device contains M channels 1, 2, 3, connected in parallel at the input and output. Each channel contains input 4 and output 5 bipolar, each of which is made in the form of an inductor. For a two-terminal 4, the first terminal is connected to the input potential terminal 6 of the device, and the second is connected to the movable contacts of the switching elements 7 and 8. For the switching element 8, a fixed contact is connected to the first terminal of the capacitor 9, in which the second terminal is connected to the common bus 10. The two-terminal 5, the first terminal is connected to the potential output terminal 11 of the device, and the second is connected to the movable contacts of the switching elements 12 and 13. At the switching element 13, a fixed contact is connected to the first terminal of the conden Sator 14, in which the second terminal is connected to a common bus 10. The device includes a discrete capacitor store (MDC) 15, containing P sections 16, 17, 18, input 19 and output 20 potential buses. Each section contains three capacitors 21, 22, 23, in which the first terminals are connected to each other, and two switching elements 24 and 25, in which the movable contacts are connected to the second terminals of the capacitors 21 and 22, respectively. The second output of the capacitor 23 is connected to a common bus 10. At the switching element 24, the fixed contact is connected to the bus 19, at the switching element 25, the fixed contact is connected to the bus 20. In each channel of the switching element 7, the fixed contact is connected to the bus 19, at the switching element 12 fixed contact connected to the bus 20.

The device operates as follows. For example, the reception of signals is carried out in the first channel, while the input two-terminal 4 through the switching element 7 is connected to the input potential bus 19 MDK, the output two-terminal 5 through the switching element 12 is connected to the output potential bus 20 MDK. For switching elements 8 and 13, the contacts are open. In the remaining channels 2 and 3, at the switching elements 8 and 13, the contacts are closed, at the switching elements 7 and 12, the contacts are open.

Section 16 is included in the MDK, while the contacts of the switching elements 24 and 25 in this section are closed. In the remaining sections 17 and 18 of the switching elements 24 and 25, the contacts are open.

In this case, the input device performs the function of a band-pass filter, in which the working passband is located in the lower part of the channel frequency range.

The remaining bandwidths in each channel are likewise included. The MDK is connected to the required channel and then the necessary section is connected. The inclusion of the required channel and the required bandwidth is carried out from the control panel of the radio receiver. In idle channels, the input and output two-terminal circuits are connected through the corresponding capacitors to the common bus and act as notch circuits. The notch frequency of the circuit is at the mid-channel frequency.

The proposed input device has advanced operational capabilities. In the device, the number of bandwidths increased by P times. In the working channel, the attenuation in the delay bands is increased due to additional notch circuits.

Information sources

1. Wide-band switching filter. Patent No. 1732475, publ. 05/07/92 BI No. 17.

Claims (1)

The input device of the radio receiver containing M channels connected in parallel at the input and output, each channel containing an input and output two-terminal device, made in the form of an inductor, characterized in that it contains an additional store of discrete capacitors containing the input and output potential buses and P sections , each of which contains three capacitors, in which the first terminals are interconnected, a movable contact of the first switching element is connected to the second terminal of the first capacitor in which the fixed contact is connected to the input potential bus of the discrete capacitor store, the second contact of the second switching element is connected to the second terminal of the second capacitor, the fixed contact is connected to the output potential bus of the discrete capacitor store, the third terminal is connected to the common bus in the third capacitor each channel at the input two-terminal network, the first output is connected to the input potential terminal of the device, the second output is connected to the movable contact of the first and of the switching elements, while the first switching element has a fixed contact connected to the input potential bus of the discrete capacitor store, the second switching element has a fixed contact connected to the first terminal of the first additional capacitor, in which the second terminal is connected to the common bus, the output of the two-terminal device with the potential output terminal of the device, the second output is connected to the movable contact of the third and fourth switching elements, while of the third switching element, the fixed contact is connected to the output potential bus of the discrete capacitor store, for the fourth switching element, the fixed contact is connected to the first terminal of the second additional capacitor, in which the second terminal is connected to the common bus.